Import image stream fails with "denied: access forbidden" from external Gitlab registry in OCP 3

Solution Verified - Updated 2019-06-19T23:51:35+00:00 -

Issue

When creating a ImageStream from a private registry on Gitlab it fails with error:

 Internal error occurred: Get https://registry.gitlab.com/v2/user/project/manifests/latest: denied: access forbidden.

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